Fullscreen.
No distractions.
Clean your monitor, test for dead pixels, improve your Zoom lighting, and stay focused. All in your browser — no install, no login, no ads.
01 — Color screen
Pick a color
Use it to clean your monitor, as Zoom lighting, or as a neutral background for photography. Pure colors — the same RGB values that reveal subpixel issues.
02 — Pixel test
Dead pixel detector
Automatically cycles through 7 critical colors every 3 seconds. Dead pixels show up as dots that don't change color with the background.
Look for dots that stay the same color regardless of the background. Dim your room lights for better visibility.
03 — Focus timer
Pomodoro
25:00
ready
04 — Shortcuts
Keyboard
While in fullscreen:
ESCExit
SpaceNext color
WWhite
BBlack
RRed
GGreen
UBlue
YYellow
CCyan
MMagenta
PPixel test
05 — Support
Keep it free
CheckPixel is free, ad-free, and always will be. If it saved you time or helped you spot a dead pixel, a coffee goes a long way.